bruder excavator help

[loie1044]

I am currently converting a bruder excavator. I have completed the track drives and am having trouble figuring out how to make the swivel for the main body. If anyone has any ideas please let me know. I would also like to know the best way to make the screw drives. I read a thread on how to make them using a wood drill bit, but I'm not sure if that is the most reliable way to go. Any help would be appreciated.